org.apache.hadoop.hbase.master.BulkReOpen.java Source code

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Here is the source code for org.apache.hadoop.hbase.master.BulkReOpen.java

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/**
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hbase.master;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutorService;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerName;

/**
 * Performs bulk reopen of the list of regions provided to it.
 */
@InterfaceAudience.Private
public class BulkReOpen extends BulkAssigner {
    private final Map<ServerName, List<HRegionInfo>> rsToRegions;
    private final AssignmentManager assignmentManager;
    private static final Log LOG = LogFactory.getLog(BulkReOpen.class);

    public BulkReOpen(final Server server, final Map<ServerName, List<HRegionInfo>> serverToRegions,
            final AssignmentManager am) {
        super(server);
        this.assignmentManager = am;
        this.rsToRegions = serverToRegions;
    }

    /**
     * Unassign all regions, so that they go through the regular region
     * assignment flow (in assignment manager) and are re-opened.
     */
    @Override
    protected void populatePool(ExecutorService pool) {
        LOG.debug("Creating threads for each region server ");
        for (Map.Entry<ServerName, List<HRegionInfo>> e : rsToRegions.entrySet()) {
            final List<HRegionInfo> hris = e.getValue();
            // add plans for the regions that need to be reopened
            Map<String, RegionPlan> plans = new HashMap<String, RegionPlan>();
            for (HRegionInfo hri : hris) {
                RegionPlan reOpenPlan = assignmentManager.getRegionReopenPlan(hri);
                plans.put(hri.getEncodedName(), reOpenPlan);
            }
            assignmentManager.addPlans(plans);
            pool.execute(new Runnable() {
                public void run() {
                    try {
                        unassign(hris);
                    } catch (Throwable t) {
                        LOG.warn("Failed bulking re-open " + hris.size() + " region(s)", t);
                    }
                }
            });
        }
    }

    /**
     * Reopen the regions asynchronously, so always returns true immediately.
     * @return true
     */
    @Override
    protected boolean waitUntilDone(long timeout) {
        return true;
    }

    /**
     * Configuration knobs "hbase.bulk.reopen.threadpool.size" number of regions
     * that can be reopened concurrently. The maximum number of threads the master
     * creates is never more than the number of region servers.
     * If configuration is not defined it defaults to 20
     */
    protected int getThreadCount() {
        int defaultThreadCount = super.getThreadCount();
        return this.server.getConfiguration().getInt("hbase.bulk.reopen.threadpool.size", defaultThreadCount);
    }

    public boolean bulkReOpen() throws InterruptedException, IOException {
        return bulkAssign();
    }

    /**
     * Unassign the list of regions. Configuration knobs:
     * hbase.bulk.waitbetween.reopen indicates the number of milliseconds to
     * wait before unassigning another region from this region server
     *
     * @param regions
     * @throws InterruptedException
     */
    private void unassign(List<HRegionInfo> regions) throws InterruptedException {
        int waitTime = this.server.getConfiguration().getInt("hbase.bulk.waitbetween.reopen", 0);
        RegionStates regionStates = assignmentManager.getRegionStates();
        for (HRegionInfo region : regions) {
            if (server.isStopped()) {
                return;
            }
            if (regionStates.isRegionInTransition(region)) {
                continue;
            }
            assignmentManager.unassign(region, false);
            while (regionStates.isRegionInTransition(region) && !server.isStopped()) {
                regionStates.waitForUpdate(100);
            }
            if (waitTime > 0 && !server.isStopped()) {
                Thread.sleep(waitTime);
            }
        }
    }
}